I just read the F2FS paper and it seems very well-designed to match the physical properties of flash, plus some interesting capabilities to keep hot/cold data separate. If there's something wrong with F2FS, let's fix it. This seems like a far better place to start from than any filesystem designed around the assumptions of a spinning disk.
It's in the mainline Linux kernel now, it's hardly some proprietary obscure vendor thing.
That's fair, it's a better state than the previous attempts.
Still, it's not as tested as, say btrfs and ext4. Can't wait to see its particular quirks.